JP4577710B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
JP4577710B2
JP4577710B2 JP2004273090A JP2004273090A JP4577710B2 JP 4577710 B2 JP4577710 B2 JP 4577710B2 JP 2004273090 A JP2004273090 A JP 2004273090A JP 2004273090 A JP2004273090 A JP 2004273090A JP 4577710 B2 JP4577710 B2 JP 4577710B2
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movable contact
contact
circuit breaker
fixed contact
fixed
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JP2006092769A (en
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智 鈴木
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河村電器産業株式会社
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring

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  • Breakers (AREA)

Description

本発明は、回路遮断器の開閉機構への異物の進入を防止する構造に関する。   The present invention relates to a structure for preventing foreign matter from entering an opening / closing mechanism of a circuit breaker.

回路遮断器は、電路に異常電流が流れると電路を遮断するようになっているが、電路を遮断するために固定接触子から可動接触子が開離する際に固定接点と可動接点との間にアークが発生すると、このアークによって可動接触子が溶けて、最悪の場合は可動接触子が切断してしまうことがある。この問題は特許文献１の回路遮断器に開示されているように可動接触子の先端部に可動接点を露出させて樹脂製の絶縁カバーを装着することにより解決することができる。   The circuit breaker is designed to break the electric circuit when an abnormal current flows in the electric circuit, but when the movable contact is separated from the fixed contact to break the electric circuit, the circuit breaker is When an arc is generated, the movable contact is melted by the arc, and in the worst case, the movable contact may be cut. This problem can be solved by mounting a resin insulating cover with the movable contact exposed at the tip of the movable contact, as disclosed in the circuit breaker of Patent Document 1.

特開２００４−５５１７２号公報（ｐ．３、第１図）JP 2004-55172 A (p.3, FIG. 1)

しかしながら、可動接触子に絶縁カバーを装着してもアークの発生時に接点が溶けることにより異物が周囲に飛散することは防止できない。このため、可動接触子の基端部をクロスバーの内部で軸支するようにした回路遮断器では、飛散した異物が可動接触子とクロスバーとの隙間に入り込んで挟まることがあり、これにより、回路遮断器の操作ハンドルをオン操作しても固定接点と可動接点が接触せずに不導通になるという問題があった。   However, even if an insulating cover is attached to the movable contact, it is not possible to prevent foreign matter from being scattered around due to melting of the contact when an arc is generated. For this reason, in a circuit breaker in which the base end of the movable contact is pivotally supported inside the crossbar, the scattered foreign matter may get caught in the gap between the movable contact and the crossbar. Even if the operation handle of the circuit breaker is turned on, there is a problem that the fixed contact and the movable contact do not come into contact with each other and become non-conductive.

本発明は、先端部に固定接点を有する固定接触子と、固定接点と対向する可動接点を先端部に有して固定接触子と接離自在にされ、可動接点を露出するようにして先端部に絶縁カバーを装着した可動接触子と、可動接触子の基端部を回動可能に軸支するクロスバーと、を備えた回路遮断器において、絶縁カバーの可動接点より基端部側に鍔部を一体に形成し、可動接触子とクロスバーとの隙間に遮断動作時に飛散する異物が進入しないようにしたことを特徴とする。 The present invention provides a fixed contact having a fixed contact at the tip and a movable contact facing the fixed contact at the tip so that the fixed contact can be separated from the fixed contact and the movable contact is exposed. In a circuit breaker provided with a movable contact having an insulating cover attached thereto, and a crossbar that pivotally supports the base end of the movable contact so that the base end of the movable cover contacts the base end side. This is characterized in that the part is formed integrally so that foreign matter scattered during the blocking operation does not enter the gap between the movable contact and the cross bar .

本発明によれば、先端部に固定接点を有する固定接触子と、固定接点と対向する可動接点を先端部に有して固定接触子と接離自在にされ、可動接点を露出するようにして先端部に絶縁カバーを装着した可動接触子と、可動接触子の基端部を回動可能に軸支するクロスバーと、を備えた回路遮断器において、絶縁カバーの可動接点より基端部側に鍔部を一体に形成し、可動接触子とクロスバーとの隙間に遮断動作時に飛散する異物が進入しないようにしたことにより、遮断動作による固定接点と可動接点の開離時に発生する異物が可動接触子とクロスバーとの隙間に進入するのを防止することができるという効果がある。 According to the present invention, the fixed contact having the fixed contact at the tip and the movable contact facing the fixed contact at the tip are made contactable with the fixed contact so that the movable contact is exposed. In a circuit breaker comprising a movable contact having an insulating cover attached to the distal end, and a cross bar that pivotally supports the proximal end of the movable contact, the proximal end side of the movable contact of the insulating cover to form a flange portion integrally by foreign matter scattered during breaking operation in the gap between the movable contact and the crossbar is not to enter, foreign matter generated during opening of the fixed contact and the movable contact by interrupting operation There is an effect that entry into the gap between the movable contact and the crossbar can be prevented.

回路遮断器は、先端部に固定接点を有する固定接触子と、固定接点と対向する可動接点を先端部に有して固定接触子と接離自在にされ、可動接点を露出するようにして先端部に絶縁カバーを装着した可動接触子と、可動接触子の基端部を回動可能に軸支するクロスバーとを備え、絶縁カバーの可動接点より基端部側に鍔部を一体に突設形成し、可動接触子とクロスバーとの隙間に遮断動作時に飛散する異物が進入しないようにする。 The circuit breaker has a fixed contact having a fixed contact at the tip and a movable contact facing the fixed contact at the tip so that the contact can be separated from the fixed contact, and the movable contact is exposed. A movable contact with an insulating cover attached to the part and a cross bar that pivotally supports the base end of the movable contact so that the flange protrudes from the movable contact of the insulating cover toward the base end. was set formed, foreign matter scattered is prevented from entering at the time of cut-off operation in the gap between the movable contact and the cross bar.

本発明に係る回路遮断器の実施例１を図１及び図２の添付図面に基づいて説明する。   First Embodiment A circuit breaker according to a first embodiment of the present invention will be described with reference to the attached drawings of FIGS.

回路遮断器は、内部に主電路を遮断するための主接点が設けられ、この主接点は金属板状の固定接触子１の先端部に固着された固定接点２と、この固定接点２と対向配置され、金属板状の可動接触子３の先端部に固着された可動接点４とで構成している。   The circuit breaker is provided with a main contact for interrupting the main electric circuit. The main contact is fixed to the tip of the metal plate-like fixed contact 1 and is opposed to the fixed contact 2. The movable contact 4 is arranged and fixed to the tip of the metal plate-like movable contact 3.

可動接触子３は、基端部がクロスバー５の軸部５ａに回動可能に軸支され、可動接触子３の先端部全体には可動接点４を露出させるようにして樹脂製の絶縁カバー６が装着され、絶縁カバー６の可動接点４を露出させた面の可動接点４より基端部側に鍔部６ａが一体に突設形成されている。可動接触子３はトーションバネ７により図１において反時計方向に付勢され、固定接触子１に圧接保持されるようになっている。   The movable contact 3 is pivotally supported by the shaft 5a of the crossbar 5 at the base end so that the movable contact 3 is exposed to the entire distal end of the movable contact 3. 6 is mounted, and a flange portion 6a is integrally formed to project from the movable contact 4 on the surface of the insulating cover 6 where the movable contact 4 is exposed to the base end side. The movable contact 3 is urged counterclockwise in FIG. 1 by a torsion spring 7 and is held in pressure contact with the fixed contact 1.

クロスバー５は第２軸部５ｂに開閉機構部８が軸支されて回動可能にされ、開閉機構部８は回路遮断器の外部から操作可能な操作ハンドル（図示せず）に連結しており、操作ハンドルを操作することにより、開閉機構部８を介してクロスバー５が回動し、可動接触子３と固定接触子１を接離させることができるようになっている。操作ハンドルをオフ操作した場合は、開閉機構部８がクロスバーの第２軸部５ｂを持ち上げ、軸部５ａを中心軸として図１において時計方向に回動する。可動接触子３はトーションバネ７により反時計方向に回動するがクロスバー５の内壁部５ｃに当接して回動が規制され、クロスバー５が更に回動することによって可動接触子３は固定接触子１から開離するようになっている。また、操作ハンドルをオン操作した場合は、逆の動作が行われる。尚、絶縁カバー６の鍔部６ａの長さは可動接触子３が開離した状態で、固定接点２とクロスバー５の内壁部５ｃの端部を結ぶ線Ａより長い寸法に形成されている。   The crossbar 5 is pivotally supported by an opening / closing mechanism 8 supported by a second shaft 5b, and the opening / closing mechanism 8 is connected to an operation handle (not shown) operable from the outside of the circuit breaker. When the operation handle is operated, the cross bar 5 is rotated via the opening / closing mechanism 8 so that the movable contact 3 and the fixed contact 1 can be brought into contact with and separated from each other. When the operation handle is turned off, the opening / closing mechanism 8 lifts the second shaft portion 5b of the cross bar and rotates clockwise in FIG. 1 about the shaft portion 5a. The movable contact 3 is rotated counterclockwise by the torsion spring 7, but the rotation is restricted by contacting the inner wall 5c of the cross bar 5, and the movable contact 3 is fixed by further rotating the cross bar 5. It is separated from the contact 1. When the operation handle is turned on, the reverse operation is performed. The length of the flange portion 6a of the insulating cover 6 is longer than the line A connecting the fixed contact 2 and the end of the inner wall portion 5c of the cross bar 5 with the movable contact 3 being separated. .

回路遮断器の主電路に異常電流が流れた場合の動作について説明する。主電路に異常電流が流れると開閉機構部８が動作し、固定接触子１から可動接触子３が開離して主電路を遮断する。この遮断動作時、固定接触子１の固定接点２と可動接触子３の可動接点４との間にアークが発生する。アークが発生にすると接点２，４が溶けて周囲に異物が飛散するが、絶縁カバー６の鍔部６ａが可動接触子３とクロスバー５の内壁部５ｃとの隙間を遮蔽して異物が進入して挟まるのを防止することができる。これにより、操作ハンドルをオン操作した際に可動接触子３とクロスバー５の内壁部５ｃとの隙間に異物が挟まって固定接点と可動接点が接触せずに不導通になるという問題を解決することができる。   The operation when an abnormal current flows in the main circuit of the circuit breaker will be described. When an abnormal current flows in the main electric circuit, the opening / closing mechanism 8 operates, and the movable contact 3 is separated from the fixed contact 1 to interrupt the main electric circuit. During this interruption operation, an arc is generated between the fixed contact 2 of the fixed contact 1 and the movable contact 4 of the movable contact 3. When the arc is generated, the contacts 2 and 4 are melted and foreign matter is scattered around. However, the flange portion 6a of the insulating cover 6 shields the gap between the movable contact 3 and the inner wall portion 5c of the cross bar 5, and the foreign matter enters. Can be prevented. This solves the problem that, when the operation handle is turned on, foreign matter is caught in the gap between the movable contact 3 and the inner wall portion 5c of the cross bar 5, and the fixed contact and the movable contact are not brought into contact and become non-conductive. be able to.

本発明に係る回路遮断器の主接点がオンの状態の要部を示す説明図である。It is explanatory drawing which shows the principal part of the state with the main contact of the circuit breaker concerning this invention turned on. 本発明に係る回路遮断器の主接点がオフの状態の要部を示す説明図である。It is explanatory drawing which shows the principal part of the state with the main contact of the circuit breaker concerning this invention turned off.

符号の説明Explanation of symbols

１ 固定接触子
２ 固定接点
３ 可動接触子
４ 可動接点
５ クロスバー
５ａ 軸部
５ｃ 内壁部
６ 絶縁カバー
６ａ 鍔部 DESCRIPTION OF SYMBOLS 1 Fixed contact 2 Fixed contact 3 Movable contact 4 Movable contact 5 Crossbar 5a Shaft part 5c Inner wall part 6 Insulation cover 6a collar part

Claims (1)

先端部に固定接点を有する固定接触子と、該固定接点と対向する可動接点を先端部に有して前記固定接触子と接離自在にされ、前記可動接点を露出するようにして先端部に絶縁カバーを装着した可動接触子と、該可動接触子の基端部を回動可能に軸支するクロスバーと、を備えた回路遮断器において、前記絶縁カバーの前記可動接点より基端部側に鍔部を一体に形成し、前記可動接触子と前記クロスバーとの隙間に遮断動作時に飛散する異物が進入しないようにしたことを特徴とする回路遮断器。 A fixed contact having a fixed contact at the tip and a movable contact facing the fixed contact at the tip so that the fixed contact can be separated from the fixed contact, and the movable contact is exposed at the tip In a circuit breaker comprising a movable contact equipped with an insulating cover, and a crossbar for pivotally supporting the proximal end of the movable contact, the proximal end side of the movable contact of the insulating cover A circuit breaker characterized in that a flange is formed integrally with the movable contact and the crossbar prevents foreign matter scattered during a breaking operation from entering the gap .
JP2004273090A 2004-09-21 2004-09-21 Circuit breaker Active JP4577710B2 (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4816241B2 (en) * 2006-05-16 2011-11-16 富士電機機器制御株式会社 Circuit breaker
US8487721B2 (en) * 2011-01-06 2013-07-16 General Electric Company Circuit interruption device and method of assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130273A (en) * 1993-10-29 1995-05-19 Matsushita Electric Works Ltd Circuit breaker
JPH09161641A (en) * 1995-12-13 1997-06-20 Mitsubishi Electric Corp Circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130273A (en) * 1993-10-29 1995-05-19 Matsushita Electric Works Ltd Circuit breaker
JPH09161641A (en) * 1995-12-13 1997-06-20 Mitsubishi Electric Corp Circuit breaker

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